I was fitted at my local GT for the 913 driver and after all said and done, I was recommended the 913 D2 9.5 Diamana Blue 62g shaft at X-stiff. It was amazing to see how changing shafts, lofts affect my result. I went back to the GT to try again the driver but they do not stock a X-stiff shaft so I tried the stiff. My numbers were not as good, shorter in distance by almost 25 yards, and more of a pull. When I was fitted not only did I have the club meant for me but I was also hitting Pro V1x as opposed to another companies ball (GT standard). Silly question but could that be why my results were so different? I am trying to decide between the another companies driver with Tour shaft stiff and GT does not stock the X-stiff from Titleist. So how can I decide??